You can't really justify your viewpoint even if based on just MSM though. You're right, car remotes are everywhere; which is why everyone knows you cannot lock a singular door with them. You lock the Entire Car. She's not likely to wait until she gets to the other car to lock hers. MB is not going to recall a simple remote locking as a significant enough detail to mention. It wouldn't be ambiguous to him if it was a remote locking, the car honks, lights flash, locks click, etc. "Maybe locked her door" Door , no "s"; singular, as in what you can only do while physically present at the object itself. And he didn't say 'locked her car'. Simple enough, right?